Voltage Levels – IEC 61000-3-6

The following table provides the different voltage levels as per IEC. It is good to note that [1] is the only IEC standard that mentions about Medium voltage. All other IEC standards consider voltages above 1kV to be high voltage.

IEC Voltage Levels[1]

Voltage Level

Range (line-to-line)

LV (Low voltage)

Un ≤ 1kV

MV (Medium voltage)

1kV < Un ≤ 35kV

HV (High voltage)

35kV < Un ≤ 230kV

EHV (Extra high voltage)

Un < 230kV

NOTE The boundaries between the various voltage levels may be different for different countries

References:

IEC/TR 61000-3-6Electromagnetic compatibility (EMC) –
Part 3-6: Limits – Assessment of emission limits for the connection of distorting
installations to MV, HV and EHV power systems